The 64-member girl group originated as a theater performance in the Akihabara district of Tokyo—known for selling electronics and the geeky otakus that frequent the area. But the group grew with girls leaving and joining continuously. Nowadays, their CDs sell millions in a day and they have a legion of fans; the group has also grown so large that they're split into "teams," and the members' ages range from 14 to 26.